Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/Class and GC2/Class pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the director unit of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Maintaining liquid nitrogen tanks and being aware of precautions is crucial; here are some key points:
Maintenance:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior, valves, pipes, and other components to ensure they are undamaged. Pay special attention to check for any leaks, corrosion, or other signs of damage.
Clean Storage Tanks: Regularly clean liquid nitrogen storage tanks to remove internal dirt and deposits. Use appropriate cleaning agents and tools, and follow the cleaning procedures and safety operation protocols.
Liquid Nitrogen Refill: Refill liquid nitrogen on a regular basis as needed. Ensure the storage tank maintains an adequate supply of liquid nitrogen to meet usage requirements.
Maintain Pressure: Regularly inspect the liquid nitrogen tank's pressure to ensure it remains within the safe range. Conduct pressure tests and adjustments as necessary.
Corrosion Protection: Appropriate anti-corrosion measures are taken based on the material and usage environment of the storage tank to extend its service life. For example, applying anti-corrosion coatings, conducting regular anti-corrosion treatments, etc.
Cautionary Notes:
Safe Operation: Strict adherence to safety operating procedures and standards is mandatory when using liquid nitrogen tanks. Operators should be trained, familiar with the properties of liquid nitrogen and safety operating requirements, and be knowledgeable about the tank equipment and operational processes.
Protective Measures: When using liquid nitrogen tanks, it is essential to take necessary precautions, such as wearing protective gloves and suits. Avoid direct contact with liquid nitrogen to prevent coldness.
Leak Control: Regularly inspect the liquid nitrogen tanks for leaks and equip them with leak detectors and alarm systems. In the event of a leak, take immediate action to contain and repair it.
Ventilation Requirements: In enclosed spaces where liquid nitrogen tanks are in use, adequate ventilation must be ensured.

A hydrostatic test of a liquid nitrogen storage tank is a common method used to check the tank's sealing and pressure resistance. The following are the general steps for a hydrostatic test of a liquid nitrogen storage tank:
Preparation: Ensure the tank interior is clean and all gases and liquids are drained from the tank. Check the tank's sealing and safety devices for proper operation.
Fill with water: Fill the internal tank with water, ensuring the water level is above the low water mark. Use a pump or other appropriate methods for filling.
Apply Pressure: Gradually increase the water pressure using a pressure pump or other pressure source until the predetermined test pressure is reached. The test pressure is typically 1.1 times the design working pressure of the tank.
Pressure Maintenance: After reaching the test pressure, maintain it for a period (typically 30 minutes to 1 hour) and observe for any abnormal conditions such as leakage or deformation in the tank.
Pressure Relief: Gradually release pressure to drain water from the tank until the tank is completely empty.
Inspection and Evaluation: Check for leaks, deformation, or other damage on the surface and inside of the tank. Evaluate the test results to ensure the tank meets design requirements and safety standards.
需要注意的是，液氮储罐水压试验需要由人员进行操作，并遵循相关的安全操作规程。在进行测试前，应仔细阅读和遵守储罐制造商提供的操作指南和安全注意事项。

The use and operation of the liquid oxygen storage tank system require attention to the following points:
Safe Operation: When operating the liquid oxygen storage system, it is mandatory to adhere to relevant safety operating procedures and standards to ensure the safety of the operators.
Tanks Selection: Choose liquid oxygen tanks that meet specifications and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, good ventilation should be maintained around the tank, and it should be kept away from flammable materials and heat sources.
Sealability Inspection: Regularly check the sealing performance of the storage tank system to ensure there are no leakage issues at valve and pipeline connections.
Pressure Control: Storage systems should be equipped with pressure gauges and safety valves, with regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content and is prone to cause fires. Set up fire barriers around the storage tank system, ban smoking and open flames, and ensure safety.
Static Protection: During the operation of the liquid oxygen system, static electricity may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the tank system and associated equipment, including valves, pipes, pressure gauges, etc. Ensure that equipment is in good condition without damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: During the operation of the liquid oxygen system, waste gas is produced, which necessitates appropriate waste gas treatment measures to minimize environmental impact.
Above are the precautions to be taken when using the liquid oxygen storage tank system, ensuring operational safety and the normal operation of the system. During operation, strictly follow the relevant operational procedures and safety operation requirements to avoid accidents.

Standard parameters for liquid oxygen storage tanks typically include the following:
Capacity: The capacity of liquid oxygen tanks is typically expressed in liters or cubic meters, with common ranges varying from a few liters to several thousand liters.
Working Pressure: The working pressure of liquid oxygen tanks is typically expressed in MPa or bar, with a common working pressure range varying from 0.2 MPa to 2.5 MPa.
Design Temperature: The design temperature for liquid oxygen tanks is typically expressed in degrees Celsius, with common design temperature ranges varying from -196°C to -150°C.
Material: The primary material for liquid oxygen storage tanks is typically stainless steel, which offers excellent corrosion resistance and low-temperature performance.
Insulation Layer: Liquid oxygen tanks are typically equipped with an insulation layer to reduce the evaporation loss of liquid oxygen. The material for the insulation layer is usually a multilayer composite material or foamed glass.
Safety Valve: Liquid oxygen storage tanks must be equipped with a safety valve to control the internal pressure of the tank and prevent bursting due to excessive pressure.
Leak detectors: Liquid oxygen storage tanks are typically equipped with leak detectors for early detection and alarm of any liquid oxygen leakage.
Appearance Design: The appearance design of liquid oxygen storage tanks typically complies with relevant standards and regulations, including color, labeling, and safety warning signs.
Note that the specific parameters of liquid oxygen tanks may vary depending on the manufacturer and application requirements; the above are merely general standard parameters. In actual use, choose the appropriate liquid oxygen tank based on the specific situation.
Zhejiang Zheteng Special Equipment adheres to the grand vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," focusing solely on the development of green energy equipment industry, and devoting high-quality products and services with competitive pricing to society!